#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
int n,m,mc,vc=0;
string steps;
cin>>n;
cin>>steps;
for(int i=0;i<n;i++)
{ if(steps[i]=='U')
     {  m++;
        if(m==0)
        { vc+=1;}}
    else
     {  m--;
        if(m==0)
        {  mc++;}}
}
cout<<vc;
    return 0;
}